3Ur-Fe Engine Control. Sfi System Fuel Pump Control Circuit

The fuel pump circuit consists of the ECM, fuel pump and fuel pump ECU (which operates the fuel pump). Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty signal and sent to the fuel pump ECU. Based on the signal sent from the ECM, the fuel pump ECU adjusts the fuel pump operation speed.

WIRING DIAGRAM

Land Cruiser. Urj200, 202 Grj200 Vdj200.3Ur-Fe Engine Control.Sfi System.Sfi System Fuel Pump Control Circuit

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP/SPEED)

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

Turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.

Check whether operating sounds can be heard while operating the fuel pump using the GTS.
OK:
Operating sounds can be heard from fuel pump.

Result
Result	Proceed to
NG	A
OK	B

Go to step 2

Go to step 8

2.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP)

Remove the fuel tank assembly (Click here).

Remove the fuel pump from the fuel tank assembly.

Clean the fuel pump to completely remove any remaining fuel.

Connect the fuel pump connector.
CAUTION:
Confirm that no fuel remains inside or on the outside of the fuel pump.

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

Turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump Duty.

Operate the fuel pump using the Active Test function and measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Tester Operation
Specified Condition
1 - 2
FPC Duty: 25%
3.2 to 4.05 V
FPC Duty: 80%
8.8 to 12.5 V

Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.

Operate the fuel pump using the Active Test function and measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Tester Operation
Specified Condition
1 - 2
ON (FPC Duty: 90%)
9.0 to 14.0 V

HINT:

Be sure to measure the voltage with all of the connectors connected.
Before performing this inspection, check that the battery voltage is between 11 and 14 V (not depleted).

Go to step 6

OK

3.CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM)

Disconnect the fuel pump ECU connector.

Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection
Condition
Specified Condition
N14-5 (FPC) - A38-50 (FPC)
Always
Below 1 Ω
N14-5 (FPC) or A38-50 (FPC) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.REPLACE FUEL PUMP

Replace the fuel pump (Click here).
HINT:
Perform "Inspection After Repair" after replacing the fuel pump (Click here).

NEXT

5.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Check the fuel pump operation.
OK:
Malfunction has been repaired successfully.

REPLACE ECM (Click here)

END

6.REPLACE FUEL PUMP ECU

Replace the fuel pump ECU (Click here).

NEXT

7.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Check the fuel pump operation.
OK:
Malfunction has been repaired successfully.

REPLACE ECM (Click here)

END

8.INSPECT FUEL PUMP ECU (POWER SOURCE VOLTAGE)

Disconnect the fuel pump ECU connector.

Turn the engine switch on (IG).

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
N14-6 (+B) - Body Ground
Engine switch on (IG)
11 to 14 V

Go to step 12

OK

9.CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP ECU)

Disconnect the fuel pump connector.

Disconnect the fuel pump ECU connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N1-4 (B2) - N14-1 (FP)	Always	Below 1 Ω
N1-5 (E2) - N14-2 (FP-)	Always	Below 1 Ω
N1-4 (B2) or N14-1 (FP) - Body ground	Always	10 kΩ or higher
N1-5 (E2) or N14-2 (FP-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10.INSPECT FUEL PUMP

Inspect the fuel pump (Click here).
HINT:
Perform "Inspection After Repair" after replacing the fuel pump (Click here).

REPLACE FUEL PUMP (Click here)

OK

11.CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM, BODY GROUND)

Disconnect the fuel pump ECU connector.

Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection
Condition
Specified Condition
A38-50 (FPC) - N14-5 (FPC)
Always
Below 1 Ω
N14-3 (E) - Body ground
Always
Below 1 Ω
A38-50 (FPC) or N14-5 (FPC) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE FUEL PUMP ECU (Click here)

12.CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - FUEL PUMP ECU)

Disconnect the fuel pump ECU connector.

Disconnect the No. 2 integration relay connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection
Condition
Specified Condition
1R-6 - N14-6 (+B)
Always
Below 1 Ω
1R-6 or N14-6 (+B) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

13.INSPECT NO. 2 INTEGRATION RELAY (FUEL PMP)

Inspect the No. 2 integration relay (FUEL PMP) (Click here).

REPLACE NO. 2 INTEGRATION RELAY

GO TO ECM POWER SOURCE CIRCUIT (Click here)

Tester Connection	Tester Operation	Specified Condition
1 - 2	FPC Duty: 25%	3.2 to 4.05 V
1 - 2	FPC Duty: 80%	8.8 to 12.5 V

Tester Connection	Switch Condition	Specified Condition
N14-6 (+B) - Body Ground	Engine switch on (IG)	11 to 14 V